The level of anger and displeasure within the Ubuntu community is at an astounding level. It's not a healthy community these days.
Clearly, the growth isn't there. Android has become the most popular Linux distribution around. DistroWatch shows more interest in Linux Mint, and a declining interest in Ubuntu. The general sentiment when following discussion online is that people are unhappy with Ubuntu, and trying alternatives, including Windows and OS X.
The same goes for Firefox and GNOME. The sentiment within the existing user communities is not pleasant. The only "positive" (more like non-negative) articles are coming from the leadership of these projects, and they often read much more like advertising or propaganda than informative articles. Much of the user-generated discussion is some expression of displeasure.
Contrast this to some of the other major projects. We see people openly happy to use Chrome or Opera. We see people happy to use Xfce and KDE. We see people happy to use Linux Mint or Debian. The difference is like light and day.
Ignoring, or even denying the existence of, the simmering tension within the Ubuntu, GNOME and Firefox communities just isn't helpful. It's going to boil over at some point, unfortunately.